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Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Marketable Securities [Abstract]
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 96us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 2us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Investment Income, Amortization of Premium	$ 345us-gaap_InvestmentIncomeAmortizationOfPremium	$ 137us-gaap_InvestmentIncomeAmortizationOfPremium

X

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of amortization of purchase premium on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Details

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